Perforation cleaner and bailer



Dec. 1, 1936. W, J, FLURY 2,062,783

' PERFORATION CLEANER AND'BAILER Filed July 17, 1954 2 SheSvtS-Sheet l fDec. 1, 1936.

w. J. FLURY l2,062,783

PERFORATION CLEANER AND BILER Filed July 1'7, 1934 2 Sheets-Sheet 2Patented Dec. l, 1936 UNITED STATS eATENT. oFFicE 2,062,783 PERFORATIONCLEANER ANDQBAlLER William J. Flury, Long Beach, Calif. f ApplicationJuly 17, 1934, Serial No. v735,605

21 Claims. (Cl. 16619) This invention relates to a tool to be used indeep wells for cleaning outperforations of screens. In producing wellsthe perforations of these screens through which the oilv flowsfrequently become clogged with dirtl or asphalt and from time to timethey must be cleared of these obstructions.

y The tool is of a type which employs a low pressure air tight chamber.Bailers employing such an air tight low pressure o-r vacuum chamber havebeen used heretofore, which embodied a shoe at the lower end, and whenthis shoe struck the bottom of the Well its upward movement operated toopen a valve closing the lower .end of -the air tight chamber, therebyenabling the pressure in the Well to cause an inrush of material intothe bailer. bailer, however, it is necessary for the shoe to encounteran obstruction in thewell or the well bottom.

One of the objects of this invention is to produce a tool involving theuse of an air tight chamber and constructed in such a way that the valveclosing the air tight chamber can be opened Within the well casing at ascreen regardless of whether the Well is obstructed at thatpoint. Inthis way it is possible to developa diierential pressure between theinterior of the well casing and the exterior at any point in the wellwhether it is obstructed or not, and the tool is not dependent upon arelative upward movement oi the shoe or any part corresponding to theshoe.

A further object of the invention is to provide a tool of this generaltype involving the use of a low pressure air tight chamber and toprovide a construction which will enable the chamber to be openedthroughthe medium of a jar imp-arted to the upper end of the tool, which ispreferably suspended on a sand line. 1

A further object of the invention is to provide a tool of this generaltype which can be readily operated through the medium of a jar impartedto the tool, to develop a differential pressure Within a Well casing ata screen, thereby developing an inrush of material or uid through the Inorder to operate such av In its general construction, the tool'involvesthe use of a valve for maintaining the air tight low pressure chamberclosed While the tool is running down the Well. One of the objects ofthe invention is to provide a construction Whereveby the pressure in theWellwill assist in main-1 taining the valve closed; ralso to provide aconstruction for the tool involvingthe'use of a relai tively movablepart which is held against movement while the tool is running down thev,well but 10 which is mounted in such a way that it can be released bya jar, thereby permitting the same to have relative longitudinalmovement on the body or relatively xed part of the tool; and one of theyobjects of the invention is to provide improved means for utilizing thisrelative movementr to effect .the opening of thevalve.

In the operation of bailers of this general type used heretofore, theentire AWeight of the` tool rests on the well bottom when the' valveopens and, while this results in charging the bailer through its .shoeat the bottom of the` bailer, there is a disadvantage that on account ofthe fact that the weight of the tool is resting on the well bottom, thetool tends to bury'25 itself in the well bottom and may become frozen,thereby causing delay and diiliculty in freeing the tool to enable thebailing operation to be continued. One ofthe objects of the invention is.to produce a tool of this general type involving the use of ak low"pressure air tight chamber, but in which the valve can be tripped andopened immediately that the bailer shoe strikes the well bottom or anobstruction in the well butv without the entire weight of the 35 toolresting on the shoe. In this Way an efcient charging of the baileroccurs without any tendency for the bailer shoe to bury itself in thewell bottom.

Further objects'of the invention will appear V4:0

hereinafter.

As regards the apparatus, this invention consists in the novel parts andthe combinationk of parts to be described hereinafter, allof whichcontribute tol produce an eiicient perforation` 45 cleaner and bailer.

In the drawings: n Fig.- 1 is a vertical section through a portionA of aWell casing and illustrating thisr tool in side elevation With the lowerendoi the tool 50 located opposite the perforations as though inreadiness to` perform the perforation cleaning or clearing operation. Inthis view certain parts are broken away. Y

`Fig. 2 is a partial side elevation and section 55 retained. The toolcan then be run up 75" illustrating details of parts of this tool uponan enlarged scale, certain parts being broken away, and showing thevalve in its open position.

Fig. 3 is a view similar to Figure 2 but showing the relation of theparts when the valve is in its closed position.

Fig. 4 is a section corresponding to Figure 2 but showing the actuatorsleeve in side elevation and indicating the manner in which it operatesto eiect the openingy of the valve. In this View the valve is indicatedin its open position corresponding to Figure 2.

Fig. 5 is a horizontal section taken on the` line 5 5 of Figure 4 andfurther illustrating details of the construction. Figure 5, however, ison a slightly larger scale thanv Figure 4.

Fig. 6 is a side elevation of a cam member which cooperates with thevalve and actuator sleeve to effect the opening of the valve.

Fig. 7 is a view similar to Figures 2 and 4 and showing an arrangementof the parts of the tool to illustrate how the jar operated tool can bereadily transformed into a ytool the valve of which will be opened kby amovement of a shoe at the bottom of the tool; and without all theweightresting on the shoe.

` Fig. 8 is a horizontal cross section taken on the line 8'-8 of Figure7, and further illustrating details of this construction; and

Fig. 9 is a view similarto Figure 7, but illustrating an embodiment ofthe invention in which the tool can operate as a bailer on the wellbottom without the entire weight of the tool resting upon the wellbottom when the yvalve is tripped or opened to charge the bailer.

In this construction, provision is made for guiding and packing the shoeclose to its lower end, and so as to permit a very considerable freemovement of the bailer shoe when it opens the valve. 4

Before proceeding to a more detailed description `of the invention, itshould be stated that the apparatus involves the use of a relativelyfixed part, which is preferably suspended on a sand line, and on thisrelatively fixed part I mount a relatively movable partv which isnormally held against movement on the relatively fixed part by yieldablemeans capable of being dislodged by a jar imparted to the relatively xedpart. In using the tool for cleaning out perforations inthe well screen,a jar kimparted to the relatively fixed part releases the relativelymovable part, and the relative movement of this part operates to effectthe opening of the valve. The air-tight chamberA within the tool may beat atmospheric pressure or, if desired, may be under partial vacuum. Inany event the pressure within the air tight chamber is a low pressurewith respect to the `pressure existing within the well, either hydraulicor gas pressure. By reason of the presence of the low pressure airchamber, it follows that immediately that the valve is opened a suddenreduction in pressure 'on the interior oi the casing at the screen isdeveloped, and this causes a differenital pressure between the interiorof the casing at this point and the exterior. For this reason a suddeninrush of material from the well will occur through the perforations,thereby clearing them. The tool is preferably provided with a suctionhead so that the material that is dislodged from the perforations kwillbe drawn into the sand chamber of the tool where it will be to themouthv of the well and dumped.

When the tool is jarred to effect the opening of the valve in aperforation cleaning operation, the relatively movable member movesrelatively downwardly on therelatively iixed part or body of the tool.Through the agency of an actuator sleeve carried by the relativelymovable member and preferably involving the use of a substantiallyhelical slot, the valve is opened. In accomplishing the opening of thevalve, this actuator sleeve cooperates with-a cam and the valve-toeffect a relative rotation of the valve and the cam. The actuator sleevealso preferably includes a longitudinal slot which cooperates with aprojection on the cam member to prevent Vrotation of the actuator sleeveand thereby enabling the helical slot formed on it to cooperate with aprojection or pin on the valve to eiIect relative rotary movement of thevalve and cam. I have discovered that by constructing theseparts so asto enable the projection on the cam member to run in the helical slotand by constructing the pin on the valve so that it can run in thelongitudinal slot of the actuator sleeve, I can readily transform thistool into an efficient bottom bailer, in which the valve will be openedthrough the medium of the shoe striking the well bottom. And inconnection with this bottom bailer, I also provide a. construction whichmay be used, if desired, which will enable theA tool to operate withoutthe entire weight of thel tool resting on the well bottom. This involvesmounting the bailer shoe on a barrel that is relatively movable upwardlyon the bailer mandrel, and in the operation of this tool the only weighton the well bottom is that of the barrel.` However, as soon as this shoestrikes the well bottom, the valve immediately commences to open.

Referring more particularly to the parts and especially to Figures 1 and2, I indicates a well casing having a screen 2 at a low level in thewell and having perforations 3 through which the liquid, such as oil,flows into the casing I. The tool is preferably provided at its upperend with an eye 4 to be attached to a sand line for running -the tooldown a well. The relatively xed part of the tool embodies an upperbarrel 5 carrying a mandrel' below the same, `which may be consideredthe relatively fixed part of the tool. The lower portion of the mandrelfis enveloped in a lower barrel 'I, see Figure 2, the lower end of whichis threaded onto a coupling 8 and the upper end of this coupling ispreferably formed into an actuator sleeve 9. The upper barrel 5 and themandrel 6 are preferably provided with an air tight low pressure chamberI0 which is closed at the lower end of the mandrel by a valve II thatseats, by an upward movement, von a suitable valve seat I2. 'Ihe valveand seat are so constructed that the valve will be substantially airtight and so that it will maintain the low pressure in the air chamberwhile the tool is running down the well.

In the lower end of the mandrel I provide a cam member or cam sleeve I3,see Figure 6, which may be attached by threads to the lower end of themandrel. This cam member or cam means I3 is preferably provided with twodiametrically opposite cam edges I4 to cooperate with projections orpins, such as the pin I5, that project radially outwardly from the valvehead. 'I'he side walls of this cam member I3 are cut away by formingwindows I6 in the same, as illustrated in Figure 6. The valve ispreferably provided with a stem I'I that is guidf Figure 4.

ed through the lower end of the cani member I3 and the cam member housesa coil spring I8 disposed around the valve stem that thrusts upwardlyagainst the valve head and normally holds it on its seat. This spring,however, may be considered as a return spring for reseating the valveafter it has been opened. The valve can be held closed, of course, bythe relatively high pressure in the well but the use of'such a spring isadvisablel where the pressure inthe air chamber I0 is not lower thanatmospheric pressure.

It should be understood that the lower barrel I is normally held in arelatively elevated position on the mandrel by yieldable means which canbe released by a jar. This yieldable means will be describedhereinafter. When the Ijar occurs, the barrel 'I slides down on themandrel and when it does so it is prevented from rotation by suitablemeans, preferably consisting of projections or pins I9, see Figures 2and 6, which project outwardly from the cam member I3 at diametricallyopposite points and which run in two longitudinal slots 2l! formed inthe actuator sleeve. The valve pins I5 project outwardly beyond the camedges I4 and are received in substantially helical slots, such as theslot 2 I, formed in the actuator sleeve. Figure 3 shows these parts intheir relation when the valve is closed. At this time the Valve pins I5will be located near the lower ends of the helical slots 2|. When thebarrel I slides downwardly, it will be evident that the slots 2| willcause a rotation of the valve on its longitudinal axis in a clockwisedirection, or in a left hand direction as viewed in This will cause thepins I5 to ride up on the cam edges I4 and open the valve. v

The tool is preferably constructed with a ,perforated suction head 22which is attached to the lower end of a sand barrel 23, the upper end ofwhich is secured to the coupling 8, and above n this suction head abottom valve 24 (indicated in dotted lines in Figure 1) is providedwhich permits any material drawn intothe perforations to pass up intothe sand chamber and this material will be retained in the sand chamberby this vflap valve.

Referring now to the means for yieldably supporting the lower barrel Ion the mandrel, it should be said that this means involves the use of arecess in the mandrel and a registering krecess in the barrel. Theserecesses when they register together form a pocket to receive yieldablemeans, preferably in the form of a spring, and one of these parts,either the mandrel or the barrel, is preferably provided with aninclined shoulder which facilitates the release of the lower barrel whena jar is imparted to the mandrel. The preferred construction for thispurpose is illustrated in Figure 3 and involves providing the upper endof the barrel with a split sleeve or bushing 25 which is screwed downinto the upper end of the body of the barrel. The inner face of thisbushing 25 has a circumferential groove 26 cut in it which registerswith, a corresponding circumferential groove 21 cut in the'v mandrel.When these two grooves register together they form a pocket to receive asplit spring ring 28 which tends, by its resiliency, to expand and inthis expanded position it lies across the lmeeting faces of the mandreland the barrel so as to lock these parts yieldably together. The upperend vof the groove 25 in the barrel is preferably formed with aninclined face 29, seel struction it will be evident that if a suicientjar or-up snap is given to the mandrel, the inclined shoulder 29 willoperate to compress the ring 28 into the groove 21, thereby releasingthe barrel 'I.

' Figure 2 shows the position of the barrel after release, the barrelhaving had sufcient movement to open the valve as indicated at the lowerend of Figure 2. This downward movement of the barrel is limited by thebushing 25 striking the upper end of an integral head or large collar 3Qformed on the mandrel. In order to insure that `the downward movement ofthe barrel 'I will be free, it is preferable to provide air vents 3lthrough the wall of the barrel to prevent compressing any air above thehead 30 within the barrel.

The upper end of the head 30 is preferably of somewhat smaller diameterthan the lower portion 32, which is ofsuicient diameter to slide on theinner side of the barrel 'I. Below the lower portion 32 ofthe collar 30,I provide the mandrel with packing collars 33 and between these collarsand the collar 3U I provide packing rings 34. These packing ringsincrease the efficiency of the tool by preventing air from beingsupplied to the lower end of the mandrel in the valve seat when thevalve opens and insuring that the only air that can pass to the valvemust pass up through the perforated suction head 22.

By correlating the pins and slots employed for effecting the opening ofthe valve in such a way that the pins I5 of the valve can operate in thelongitudinal slots 20 instead of in the helical slots 2l, it is possibletotransform this` perforation cleaner into a bottom bailer operating onthis same general principle of suddenly reduced pressure. Figure '7illustrates the tool transformed in this way. In Figure 7, 1a; indicatesthe barrel of the tool mounted on a mandrel 3a. In this tool the lowerend of the bushing 25a rests cn the collar 30a. while the tool isrunning down the well; but in assembling the tool the valve pins, suchas the Valve'pin I5a, are put in place to run in the straight vslots o rlongitudinal slots 20a. of the 'actuator cam 9a.. The lower end of thebarrel 'Ia attaches to a coupling 8a, corresponding to the coupling 8ofFigure 2, and a sand barrel 23a. is provided below this point carryingan ordinary bailer shoe 35. If desired, a coiled spring 36 may be-provided around the mandrel 6a, and between the packing collar 33a. andthe upper end of the actuator sleeve 9m. This spring is a light spring,thefunction of which is 'to prevent any accidental or premature upwardmovement of the barrel `la, which might be suicient to open the valvewhen the tool is running down the well.

Inaddition to inserting the pins I5a in the slotsv 20a. in the assemblyshown 'in Figure 7, the pins |90. of the cam member I3@ are inserted inthe helical slots 2Ia.. With this arrangement of parts, it will beevidentthat when the bailer shoe 35 strikes the well bottom an upwardmovement ofthe barrel 'la will occur and the actuator sleeve Sia,- willalso move upwardly. When this movement occurs, the helical slots 2 Ia.in the actuator sleeve will cause a relative rotation of the valveand'cam member I3a., thereby causing the valve pins I5a. to ride up onthe cam edges Ma; to open the valve.

In this tool shown in Figure 7, it will be evident that the entireweight of the toolis not on the well bottom lout `only the weight of thevalve 'la plus the pressure of the light spring 36.

In Figure 9 I illustrate a modified embodiment pressure within thecasing opposite the perforaof the type of tool shown in Figure 7, inwhich the barrel is guided on the mandrel below the valve as well asabove it. The tool, however, operates in substantially the same way asthe tool illustrated in Figure 7. In the construction shown in Figure 9,I provide a mandrel 31 with a lower extension 38 which may be connectedto the same by a coupling 39 which may carry the flap Valve 40 forretaining the charge. The lower portion of the mandrel 31 then operatesas a sand barrel. In other words, the flap valve 40 would be at aconsiderable distance below the valve which is located at about thelevel of the actuator sleeve 4I. The lower end of the extension 38 isformed jwith packing collars 42 which run in a lower barrel 43. Inrunning down the well, the lower end of the coupling 44 rests on theupper packing collar 42. When the shoe 45 attached to the lower end ofthe barrel 43 strikes the well bottom, the barrel-43 slides upwardly andthis upward movement raises the actuator sleeve 4I and opens the valve.`If desired, a cushion spring 46 may be provided between the upper end ofthe shoe 45 and the lower end of the mandrel extension 38.

In the operation of the tool as a perforation cleaner, the jar todislodge the relatively movable member or barrel 'I may be imparted inany manner but preferably by lowering the tool and suddenly stopping thelowering movement. This gives a snap .action or upjar to the tool whichwill dislodge the relatively movable member or barrel 'I, therebyoperating the valve.

The spring I8 of the valve is preferably attached to the valve so thattorsion in the spring f tends to keeprthe valve pins I5 up against theactuating edge of the helical slot 2|. This insures that there will beno lost motion in the operation of the tool. In other words, as soon asthe relative longitudinal movement of the actuator sleeve 9 occurs, thevalve will immediately commence to open. l

The mode of operation of the tool when used as a perforation cleanerconsists in running the tool down the well until the suction head 22 isllocated opposite the perforations of the screen 2 in the well'. Then bya sudden down movement and snap action or jar on the sand line, theinclined shoulder 29 on the bushing 25 of the barrel will compress thespring ring 28 and release the barrel 1. The barrel I carrying with itthe actuator sleeve 9 will then move downwardly. In this movement thepins I9 on the cam member I3 running in the straight slots will preventrotation of the actuator sleeve. `Its helical slots 2I will, therefore,move the pins I5 of the valve to cause a relative rotation of the valvein the cam member, thereby causing the valve pins I5 to ride up on thecam edges I4 to open the valve. By reason ofthe presence of the lowpressure air chamber Ill there will be la sudden reduction in tions 3and there will be immediately developed an inrush of material throughthe perforations of the screen to clear it. Material taken in in thisway will be drawn into the suction head 22 through its perforations andup into the sand Vv.except that the spring ring 28 used in the cleaningof perforations is removed from the tool and the shoe is substituted forthe suction head 22 shown in Figure 1. In the assembly of Figure 7, itshould be remembered that the pins I9a of the cam member run in thehelical slots 2Ia instead of the straight slots. When the shoe 35strikes bottom a relative upward movement of the barrel 'la occurs andthe helical slots 2 Ia give a rotation of the cam member I3a in a righthand direction, thereby causing the cam edges I4al to ride forwardlyunder the valve pins I5a to lift the valve.

It is understood that the embodiment of the invention described hereinis only one of the many embodiments this invention may take `and I donot wish to be limited in the practice of the invention, nor in theclaims, to the particular embodiment set forth.

What I claim is: n

1. A tool of the kind described, having a low pressure air-tight chamberwithin the same, a valve for maintaining the air-chamber closed whilethe tool is riuining down the well, said tool including a relatively xedpart and a relatively movable part capable of vertical movement on thefixed part, yieldable means between the fixed part and the movable part,one of said parts having a shoulder temporarily engaging the yieldablelmeans for temporarily holding the relatively movmovement for opening thevalve.

2. A tool of the kind described, having a easing with a low pressureair-chamber within the same, a valve for maintaining the air-chamberclosed while the tool is running down the well, a spring associated withthe valve for normally holding the same closed, said casing including arelatively fixed part and a relatively movable part, yieldable meansmounted between vthe relatively xed part and the relatively movable partfor temporarily holding the relatively movable part against longitudinalmovement on the fixed part and operating when a jar is imparted to therelatively fixed part, to become dislodged from the relatively fixedpart, and thereby release the relatively movable part, and cause arelative downward movement of the same on the fixed part,

and means .actuated by the relatively movable` part during its saidrelative movement to open: Y the valve.

3. A tool of the kind described, having a low pressure air-tight chamberwithin the same, a valve for maintaining the air-chamber closed whilethe tool is running down the well, said tool Y including a relativelyxed part and a relatively movable part capable of vertical movement onthe xed part', said two parts having adjacent circumferential walls withregistering recesses therein forming a pocket, yieldable means mountedin said pocket, one of said two'parts having a shoulder engaging theyieldable means for temporarily holding the relatively mov-able;

part against longitudinal movement on the xed part and cooperating withthe yieldable means upon a sudden relative upward movement of therelatively iixed part, to release the relatively mov-able part andthereby cause relative downward movement of the relatively movable parton the fixed part, and means actuated by said 3,5.: and means actuatedby said relative downward.-

'relatively movable part in said relative downward movement, for openingthe valve.

4. A tool of rthe kind described, having a low pressure-air-tightchamber within the same, a valve for maintaining the air-chamber closedwhile the tool is running down the well, said tool including arelatively fixed part and a relatively movable part capable of verticalmovement on the fixed part, said two parts having adjacentcircumferential walls with registering circumferential recesses thereinforming an annular pocket', a spring-ring mounted in said pocket, one ofsaid two parts having a shoulder engaging the spring-ring fortemporarily holding the relatively movable Vpart against longitudinalmovement on the xed part and cooperating with the spring-ring when a jaris imparted to the xed part, to release the relatively movable part andthereby cause relative downward movement of the relatively movable parton the xed part, and means actuated by said relatively movable part insaid rel-ative downward movement, for opening the valve. v

5. A tool of the kind described, having a low pressure air-tight chamberwithin 'the same, a valve for maintaining the air-chamber closed whilethe tool is running down the well, said tool including a relativelyfixed part and a relatively movable part capable of vertical movement onthe fixed part, said two parts having adjacent circumferential wallslwith registering circumferential recesses therein registering togetherto form an annular pocket, a spring-ring mounted in said pocket, one ofsaid two parts having an inclined shoulder engaging the spring-ring fortemporarily holding the relatively movable part against longitudinalmovement on the fixed part and cooperating with the spring-ring when ajar is imparted to the relatively nxed part, to release the relativelymovable part and thereby cause relative downward movement of therelatively movable part on the fixed part, and means actuated by saidrelatively movable part in said relative downward movement, for openingthe valve.

6. A tool of the kind described, having a low pressure air-tight chamberwithin the s-ame, a valve for maintaining the air-chamber closed whilethe tool is running down the well, said tool including a relativelyfixed part and a relatively movable part capable of vertic-al movementon the xed part, said two parts having adjacent circumferential wallswith registering circumferential recesses therein registering togetherto form an annular pocket, a spring-ring mounted in said pocket, one ofsaid two parts having an inclined shoulder engaging the spring-ring fortemporarily holding the relatively movable part against longitudinalmovement on the xed part and cooperating with the spring-ring when a jaris imparted to the relatively fixed part, to release the relativelymovable part and thereby cause relative downward movement of therelatively movable part on the fixed part, a cam, means on the valvecooperating with the cam whereby relative rotation of the cam and valvewill open the valve, and means actuated by said relatively movable partin said relative downward movement thereof, for eiecting a relativerotation of the cam and valve to open the valve.

'7. A tool of the kind described, having a low pressure air-tightchamber within the same, a valve for maintaining the air-chamber closedwhile the tool is running down the well, said tool including arelatively fixed part and a relatively movable part cap-able' ofvertical movement on the fixed part, said two parts having adjacentcircumferential walls with registering circumferential recesses thereinregistering together to form an annular pocket, a spring-ring mounted insaid pocket, one of said two parts having van inclined shoulder engagingthe spring-ring for tempo-h rarily holding the relatively movable partagainst longitudinal movement on the xed part and cooperating with thespring-ring when a jar is imparted to the relativelyiixed'part, torelease the relatively movable part and thereby/cause relative downwardmovement of the relatively Ymovable part on the fixed part, a cam, saidvalve having-means cooperating with the cam upona relative rotarymovement of the valve and cam, f

to open the valve, an actuatorv sleeve rigid with said relativelymovable part and having a sub,- stantially helical guideway thereincooper-ating with said valve and cam when said relatively removable partmoves downwardly, to open the valve.

8. A tool of the kind described, having a low pressure air-tight chamberWithin' the s-ame, a valve for maintaining the air-chamber closed whilethe tool is running down the well,fsaid tool including a relativelyfixedA part and a relatively movable part capable of vertical movementon the fixed part, said two parts having adjacent circumferential wallswith registering `circumferential recesses therein registering togetherto form an annular pocket, a spring-ring mounted in said pocket, oneofvsaid two parts having an in# clined shoulder engaging the spring-ringfor temporarily holding the relatively movable part against longitudinalmovement on the fixed part and cooperating with the springring when ajar is imparted to the relatively xed part, to release the relativelymovable part and thereby cause relative downward movementv of therelatively movable part on the iixed part, an actuator sleeve rigid withsaid relatively movable part and having a substantially helical slottherein engaging the valve and operating when the said relative downwardmovement of'the relatively movable part occurs, to effect a relativerotation of the valve and cam to open the valve, and means forpreventing relative rotation of the relatively movable part on therelatively xed part when the relatively movable part has its relativedownward movement.

9. A tool of the kind described, having a low pressure air-tight chamberwithin the same, a valve for maintaining the air-chamber closed whilethe tool is running down the well, said tool including a relativelyfixed part and a relatively movable part capable of vertical movement onthe xed part, said two parts having adjacent circumferential walls withregistering recesses therein forming a pocket, yieldable means mountedin said pocket, one of said two parts having a shoulder engaging theyieldable means for temporarily holding the relatively movable partagainst longitudinal movement on the fixed part andcooperating with theyieldable means, when a jar is imparted to the relatively fixed part torelease the relatively movable part and thereby cause relative downwardmovement of the relatively movable part on the fixed part, an' actuatorsleeve rigidly carried by the relatively movable part and having alongitudinal slot therein,

means fixed with respect,` to the relatively fixed ment, sald actuatorsleeve having a substantially helical slot, said valve having meansengaging the said helical slot to eiect rotation of the sleeve when therelatively movable part has its said relative downward movement, and arelatively i'lxed cam cooperating with the said means on the valve toopen the valve when the valve is rotated 10. A tool of the kinddescribed, having a low pressure air-tight chamber within the same, avalve for maintaining the air-chamber closed while the tool is runningdown the well, said tool including a relatively fixed part and arelatively movable part capable of vertical movement on the xed part,said two parts having adjacent circumferential walls with registeringrecesses therein forming a pocket, movable yieldable means mounted insaid pocket, one of said two parts having a shoulder engaging theyieldable means for temporarily holding the relatively movable partagainst longitudinal movement on the xed part and cooperating with theyieldable means when a jar is imparted to the relatively i'lxed part, torelease the relatively movable part and thereby cause relative downwardmovement of the relatively movable part on the relatively xed part, anactuator sleeve carried by the relatively movable part and having alongitudinal slot therein, a projection on the relatively fixed partreceived in the said slot for preventing rotation of the relativelymovable part when it has its relative downward movement, said actuatorsleeve having a substantially helical slot therein and said valve havinga projection received in said helical slot, and a relatively fixed camcooperating with the projection on the valve and the helical slot toopen the Valve when the relatively movable part has itsrsaid relativedownward movement.

11. A tool of the kind described, having a low pressure air-tightchamber within the same, a valve for maintaining the air-chamber closedwhile the tool is running down` the well, said tool including arelatively fixed part and a relatively movable part capable of verticalmovement on the fixed part, said two parts having adjacentcircumferential walls with registering recesses therein forming apocket, movable yieldable means mounted in said pocket, one of said twoparts having a shoulder engaging the yieldable means for temporarilyholding the relatively movable part against longitudinal movement on thexed part and cooperating with the yieldable means when a jar is impartedto the relatively ixed part, to release the relatively movable part andthereby cause relative downward movement of the relatively movable parton the relatively fixed part, an actuator sleeve carried by therelatively movable part and having a longitudinal slot therein, aprojection on the relatively fixed part received in the said slot forpreventing rotation of the relativelymovable part when it has itsrelative downward movement, said actuator sleeve having a substantiallyhelical slot therein and said valve having a projection received in saidhelical slot, a cam iixed on the relatively xed part cooperating withthe projection on the valve and the helical slot to open the valve whenthe relatively4 movable part has its said relative downward movement,said relatively fixed part having means at its lower end for securing abailer shoe to the same, a projection on the valve being capable ofrunning in the longitudinal slot, and the projection on the relativelyfixed member being capable of running in the helical slot,

thereby enabling a relative upward movement of the relatively movablepart to effect a relative rotation of the valve and cam to open thevalve.

12. A tool of the kind described, having a low pressure air-tightchamber within the same, a

means for temporarily holding the relatively L,

movable part against longitudinal movement on the fixed part, anactuator sleeve carried by the relatively movable part having alongitudinal slot therein, a pin on the relatively fixed part running inthe said slot, said actuator sleeve having a substantially helical slot,a pin on the valve running in the said helical slot, a cam xed withrespect to the relatively xed part and cooperating with the said valvespin to open the valve, said actuator sleeve being capable of attachmentin a second position with the first-named pin received in the helicalslot and with the said valves pin received in the longitudinal slot,thereby enabling a relative upward movement of the relatively movablepart to eiect relative rotation of the valve and cam to open the valve.

13. A tool of the kind described, having a low pressure air-tightchamber within the same, a valve for maintaining the air chamber closedwhile the tool is running down the well, said tool including arelatively iixed part and a relatively movable part capable of verticalmovement on the iixed part, an actuator sleeve rigid with the relativelymovable part having a substantially helical slot therein, a pin on therelatively xed part running in the said helical slot, said actuatorsleeve also having a longitudinal slot, a pin on the valve running inthe said longitudinal slot, and a cam xed with respect to the relativelyxed part cooperating with the valve pin to open the valve upon arelative upward movement of the relatively movable member, thefirst-named pin being capable of running in the longitudinal slot, andthe valve pin being capable of running in the substantially helical slotthereby enabling the actuator sleeve to be attached in a second positionin which the relatively movable part can open the valve by a relativedownward movement instead of an upward movement.

14. A tool of the kind described, having a tubular mandrel with anair-tight chamber therein, a barrel enveloping the mandrel and capableof downward movement thereon, the outer surface of said mandrel having acircumferential groove therein, the inner surface of said barrel havinga circumferential groove therein capable of registering with therst-named circumferential groove to form an annular pocket, aspring-ring mounted in said pocket and normally preventing relativemovement of the barrel on the mandrel, a valve for maintaining theairchamber closed while the tool is running down the well, an actuatorsleeve rigid with the barrel, a spring associated with the valve, andcam means associated with the valve, said actuator sleeve having meanscooperating with the valve and the cam to open the valve when a relativedownward movement of the barrel occurs with respect to the mandrel, saidspring-ring operating when a jar is imparted to the mandrel to releasethe barrel for relative downward movement and thereby eiect the openingof the valve.

15. A tool of the kind described, having a low pressure air-tightchamber within the same, a valve for maintaining the air chamber closedwhile the tool is running down the Well, said tool including a tubularmandrel, a barrel enveloping the mandrel, normally in a depressedposition and capable oi vertical upward movement on the mandrel, a shoecarried by the barrel, an actuator sleeve carried by the barrel to moverelatively upwardly on the mandrel when the shoe strikes an obstructionor the well bottom, stop-means for limiting the upward movement of thebarrel on the mandrel, cam-means cooperating with the valve, saidactuator sleeve having means for effecting a relative rotation of thevalve and cam-means, to open the valve before the barrel engages thestop-means, whereby the entire weight of the tool does' not come uponthe shoe.

16. A tool of the kind described, having a low pressure air-tightchamber within the same, a valve for maintaining the air chamber closedwhile the tool is running down the well, said tool including a tubularmandrel, a barrel enveloping the mandrel, normally in a depressedposition and capable of vertical upward movement on the mandrel, a shoecarried by the barrel, an actuator sleeve carried by the barrel to moverelatively upwardly on the mandrel when the shoe strikes an obstructionor the Well bottom, stop-means for limiting the upward movement of thebarrel on the mandrel, cam-means cooperating with the valve, saidactuator sleeve having means for effecting a relative rotation of thevalve and cam-means, to open the valve before the barrel engages thestop-means, whereby the entire weight of the tool does not come upon theshoe, and a spring between the mandrel and the barrel to press the shoeagainst the Well bottom when the shoe strikes the same. n

17. A well tool of the kind described, having a low pressure air-tightchamber within the same, a valve for maintaining the air chamber closedwhile the tool is running down the well, said tool including arelatively fixed part and a relatively movable part capable of verticalshifting movement on the fixed part, means including a shoulder and ayieldable member temporarily engaging the shoulder for normallypreventing movement of the relatively movable part on the relativelyiixed part while the tool is running down the well, said yieldablemember enabling a jar to the tool to dislodge the yieldable member fromthe shoulder and cause a shifting of the relatively movable part on therelatively xed part for effecting the opening of the said valve.

18. A well tool of the kind described, having a low pressure air-tightchamber within the same, a valve for maintaining the air chamber closedwhile the tool is running down the well, said tool including arelatively xed part and a relatively movable part capable of verticalshifting movement on the fixed part, means including a shoulder and ayieldable member engaging the shoulder for normally preventing movementof the relatively movable part on the relatively iixed part while thetool is running down the well, said yieldable member enabling a jar tothe tool to dislodge it from said shoulder and cause a shifting of therelatively movable part on the relatively xed part, and valve openingmeans brought into action by the relative movement of the relativelymovable part on the relatively xed part for opening the Valve, saidyieldable member constructed so that it will operate to permit therelatively movable member to maintainr itself in its shifted positionafter the shifting movement has occurred.

19. A well tool of the kindv described, having a low pressure air-tightchamber within the same, a valve for maintaining the air chamber closedwhile the tool is running down the well, said tool including arelatively fixed part and a relatively movable part capable .of verticalshifting movement on the fixed part, means including a shoulder and ayieldable member engaging the shoulder for normally preventing movementof the relatively movable part on the relatively iixed part while thetool is running down the. well, said yieldable member enabling a jar tothe tool to cause a shifting of the relatively movable part on therelatively fixed part, and means for effecting the opening of the valvebrought into action by jarring the yieldable means off the shoulder.

20. A well tool of the kind described, having a low pressure air-tightchamber within the same, a valve for maintaining the air chamber closedwhile the to-ol is running down the well, said tool including arelatively xed part and a relatively Y movable part capable of. verticalshifting movement on the fixed part, means including a shoulder and ayieldable member engaging the shoulder for normally preventing movementof the relatively movable part on the relatively fixed part while thetool is running down the well,

said yieldable member Ienabling a jar to the tool to cause a shifting ofthe relatively movable part on the relatively xed part, valve openingmeans, said valve opening means and said Valve being relativelyrotatable with respect to each other, and actuating means carried by therelatively movable part for effecting a relative rotation between thevalve opening means and the valve when the relatively movable part ismoved onv the relatively xed part, to effect the opening of the Valve.

21. A well tool of the kind described, having a low pressure air-tightchamber within the same,v

a valve for maintaining the air chamber closedr while the tool isrunning down the' well, said tool including a relatively xed part and arelatively movable part capable of vertical shifting movement on thefixed part, means` including a shoulder and a yieldable member engagingthe shoulder for normally preventing movement of. the relatively movablepart on the relatively fixed part while the tool is running down thewell, said yieldable member enabling a jar to the tool to cause ashifting 'of the relatively movable part on the relatively iixed part,valve openingy means having a cam edge, said valve .opening means andsaid valve being relatively rotatable with respect to each other, andsaid valve having a pin engaging the'r cam edge, and actuating meanscarried by the relatively movable part having slots therein for engagingthe said pin and the said valve opening means for eiecting a relativerotation of the valve and the valve opening means when a relativemovement of the relatively movable member on the relatively xed memberoccurs, to open the valve.

WILLIAM J. FLURY.'

